Am I required to tell my employer my personal email address or my marital status?

Question Details:

Every year we are sent an email to update our personal email. Address/Emergency contact/Phone. All of a sudden they are asking for our home phone, mobile phone, personal email, and our marital status. This is making me curious about why they need my personal email address and what is the point of knowing my marital status? It has no bearing on my job that Ihave worked at for what seems like 100 years. Just seems very suspicious to me, like they are going to start doing searches on my email on the web or something. I just want to know if this is something they can legally ask? Do I have to give this info? 

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